    "aggiungere" {:synsem {:cat :verb
                           :sem {:pred :add}}}
    "aiutare"
-   {:synsem {:cat :verb
-             :essere false
-             :sem {:pred :aiutare
-                   :activity true
+    {:synsem {:essere false
+              :sem {:pred :aiutare
+                    :activity true
                     :obj {:human true}}}}
    "alto"
    [;; non-comparative:

   [dag_unify.core :refer [fail? get-in merge]]))

(def lexicon-source
  {"Antonia"
   {:synsem {:sem {:pred :antonia
                   :human true}
             :agr {:number :sing
                   :person :3rd
                   :gender :fem}
             :propernoun true}}
   "Antonio"
   {:synsem {:agr {:number :sing
                   :person :3rd
                   :gender :masc}
             :sem {:pred :antonio
                   :human true}
             :propernoun true}}
   "a"

   "le"
   {:synsem {:cat :det
             :def :def
             :gender :fem
             :number :plur}}
   "lei"
   (let [common {:synsem {:cat :noun
                          :pronoun true
